What are the J2EE Cluster Node Types?

The BOTH cluster node type indicates that both the Web and EJB Services are running on that node. The node types allowed are:

BOTH - If a cluster node is defined as BOTH, both EJB and Web containers are started. Select this option when the application has both enterprise and Web components. If you specify BOTH, it is required that you enable both EJB and Web Services from the server_config.xml file as shown in the snippet:

<service name="WebContainer" enabled="true" class-name="com.pramati.web.WebServer"> <service name="EJBContainer" enabled="true" class-name="com.pramati.ejb.EJBContainer">

Web - If a cluster node is defined as Web, only the Web container is started. EJB components are not available on this node. Select this option when the application has only JSPs and other Web components. A Standalone Web node can act as an EJB Load Balancer. Following is a snippet from server_config.xml:

<service name="WebContainer" enabled="true" class-name="com.pramati.web.WebServer"> <service name="EJBContainer" enabled="false" class-name="com.pramati.ejb.EJBContainer">

EJB - If a cluster node is defined as EJB, only the EJB container is started. Web components are not available on this node. Select this option when the application consists of only enterprise beans. Following is a snippet from server_config.xml:

<service name="WebContainer" enabled="false" class-name="com.pramati.web.WebServer"> <service name="EJBContainer" enabled="true" class-name="com.pramati.ejb.EJBContainer">

To summarize:

Table 1: J2EE Cluster Node Type and required services

J2EE Node Type Web Container EJB Container

BOTH Required Required

EJB - Required

Web Required -

Is there an Advanced Configuration?

Typically a J2EE Cluster node means a BOTH node. But a J2EE Cluster can also be configured as a Web only cluster, EJB only cluster, or a combination of Web and EJB nodes.

Related Topics:

J2EE Node Type	Web Container	EJB Container

BOTH	Required	Required
EJB	-	Required
Web	Required	-


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